Revert "Add "own" symbols support."

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 7e1c5b1eb37ab6cc5653d4f9f8d2c67fbb48f362..432d6133bd42437023aa55a9929aa9670971121b 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -3372,7 +3372,6 @@ bool Name::Equals(Handle<Name> one, Handle<Name> two) {
 ACCESSORS(Symbol, name, Object, kNameOffset)
 ACCESSORS(Symbol, flags, Smi, kFlagsOffset)
 BOOL_ACCESSORS(Symbol, flags, is_private, kPrivateBit)
-BOOL_ACCESSORS(Symbol, flags, is_own, kOwnBit)
 
 
 bool String::Equals(String* other) {
@@ -6497,10 +6496,6 @@ uint32_t Name::Hash() {
   return String::cast(this)->ComputeAndSetHash();
 }
 
-bool Name::IsOwn() {
-  return this->IsSymbol() && Symbol::cast(this)->is_own();
-}
-
 
 StringHasher::StringHasher(int length, uint32_t seed)
   : length_(length),